Keira Knightley flashes her ring as she and fianc James Righton indulge in a spot of smooching

Kiss me Keira! Newly engaged actress flashes her ring as she and fianc James Righton indulge in a spot of smooching

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UPDATED:

16:13 GMT, 28 May 2012

They are a couple who are clearly over the moon to have gotten engaged and they aren't afraid to show it.

Keira Knightley and her new fianc James Righton looked completely smitten as they walked around in London sharing a series of passionate kisses.

The pair couldn't tear themselves apart as they browsed around the shops and the actress proudly flashed her engagement ring which sat glittering on her finger.

Kiss me Keira: Miss Knightley and her fianc James Righton were seen smooching as they walked along arm in arm in London yesterday

The bling: Keira proudly wore her engagement ring, which appears to be a circular diamond on a thin band

The ring is a single circular diamond set into a thin gold band.

Keira was also wearing another ring on her left hand, a Love ring by Zoe and Morgan.

Last week a spokesperson for the star confirmed the pair were engaged after 15 months together.

The London-born star, 27, started dating the 28-year-old Klaxons rocker last year after being introduced by mutual friend Alexa Chung.

Keira opted for a cool summer look for their shopping trip over the weekend and was dressed in a light denim skirt and a plain white T-shirt.

James stepped out in a pair of light coloured trousers, a white T-shirt and a striped cardigan.

What a tease: As well as planting several big kisses on James lips Keira was also seen lightly bighting his lower lip

Oh so close: The 27-year-old actress had both hands on her man and was even seen resting her head on his shoulder

Keira wasn't content with just holding James hand and she had her other arm tucked under his armpit.

As well as planting several big kisses on his lips Kiera was also seen lightly biting his lower lip.

When the pair did manage to pull their mouths apart she was seen resting her head on his shoulder.

Since they started dating last year, the couple have kept their romance under wraps and are yet to pose together on a red carpet.

However, they have been photographed out together casually near their East London home several times.

Hands on: The pair walked hand-in-hand as they enjoyed their day shopping

Summer style: The actress wore a knee-length denim skirt and a white T-shirt

Lucky in love: The couple have been dating for 15 months and were introduced by a mutual friend

The Oscar-nominated star previously dated Pride & Prejudice co-star Rupert Friend for five years before splitting in January 2011.

Last year, her father William said on her split from Friend: 'It wasn’t a decision that either of them took lightly. I know they gave it a great deal of thought. I don’t think there was any one thing that led to their break-up – it was a whole raft of things, I think.'

She also had a two-year romance with Irish model and actor Jamie Dornan before splitting in August 2005.

Knightley has ascended to becoming one of Britain's biggest Hollywood stars since leaping to fame in Bend It Like Beckham 10 years ago.

Keira's latest project is a film with Steve Carell called Seeking A Friend For The End of The World and it is about spending your moments with the ones you love